Gerik and Hawra enter into a contract by which Hawra agress to cut Gerik's grass once per week for $30 . Hawra is 90 years old. Hawra dies two weeks later. Her estate

a.) must find another person to cut Gerik's lawn for $30 once per week

b.) is discharged from any further obligations under the contract

c.) is discharged from any further obligations under the contract only if Gerik knew it was unlikely that Hawra would live to complete the contract

d.)None of the above